フラグメントは、ビューを作成していない

Question

MyFragment.java

public class MyFragment extends Fragment { 
    private onItemSelectedListener listener; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View view = inflater.inflate(R.layout.fragment, container, 
       false); 
     btn_myButton = (Button) view.findViewById(R.id.btn_new_client); 
     btn_myButton .setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 
       updateDetail("New Layout"); 
      } 
     }); 
     return view; 
    } 

    Button btn_myButton; 

    public interface onItemSelectedListener { 
     public void onItemSelected(String link); 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     if (activity instanceof onItemSelectedListener) { 
      listener = (onItemSelectedListener) activity; 
     } else { 
      throw new ClassCastException(activity.toString() 
        + " must implemenet OnItemSelectedListener"); 
     } 
    } 
    public void updateDetail(String s) { 
     listener.onItemSelected(s); 
    } 
} 

MainActivity.java

public class MainActivity extends Activity implements 
    onItemSelectedListener { 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    setContentView(R.layout.main_activity); 
    super.onCreate(savedInstanceState); 
} 

public void onItemSelected(String link) { 
    FragmentManager manager = getFragmentManager(); 
    FragmentTransaction transaction = manager.beginTransaction(); 
    Fragment fragment; 
    if ("New Layout".equals(link)) { 
     fragment = new Fragment1(); 
     transaction.replace(R.id.detailFragment, fragment); 
     transaction.commit(); 
    } 
} 
} 

Fragment1.java

public class Fragment1 extends Fragment { 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     View v = inflater.inflate(R.layout.newfragmentt, container, 
       false); 
     return v; 
    } 

    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
    } 
} 

fragment.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <Button 
     android:id="@+id/btn_new_client" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:ems="8" 
     android:gravity="center|center_vertical" 
     android:padding="2dp" 
     android:text="@string/new_client" 
     android:textColor="#FFFFFF" > 
    </Button> 

</LinearLayout> 

main_activity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:background="#4B6C9E" 
    android:baselineAligned="false" 
    android:orientation="horizontal" > 

    <fragment   
     android:id="@+id/FragmentId" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="1" 
     class="com.examples.MyProject.MyFragment" > 
    </fragment> 
    <FrameLayout 
     android:id="@+id/detailFragment" 
     android:layout_width="0dp" 
     android:layout_height="match_parent" 
     android:layout_weight="2" > 
    </FrameLayout> 

</LinearLayout> 

LogCatエラー：

FATAL EXCEPTION: main 
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.elintsys.iCaseDiary/com.examples.MyProject.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class fragment 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
    at android.app.ActivityThread.access$600(ActivityThread.java:123) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:137) 
    at android.app.ActivityThread.main(ActivityThread.java:4424) 
    at java.lang.reflect.Method.invokeNative(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:511) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
    at dalvik.system.NativeStart.main(Native Method) 
Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class fragment 
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697) 
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:739) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
    at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251) 
    at android.app.Activity.setContentView(Activity.java:1862) 
    at com.examples.MyProject.MainActivity.onCreate(CaseEntryActivity.java:15) 
    at android.app.Activity.performCreate(Activity.java:4492) 
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
    ... 11 more 
Caused by: java.lang.IllegalStateException: Fragment com.elintsys.iCaseDiary.CaseEntryFragment did not create a view. 
    at android.app.Activity.onCreateView(Activity.java:4293) 
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673) 
    ... 21 more 
Sending signal. PID: 16275 SIG: 9 

私の友人を助けてください。

Answer 1

あなたはこの逆にする必要があります：あなたの活動のonCreateに

super.onCreate(savedInstanceState). 
setContentView(R.layout.main_activity); 

：この中

setContentView(R.layout.main_activity); 
super.onCreate(savedInstanceState). 

を。

Answer 2

super.onCreateの後にsetContentViewを呼び出していたとしても、このエラーが発生しました。私の場合は、setContentView前に呼び出されていた私のスーパークラスののonCreateメソッドに労働者フラグメントを設定し、ここで説明バグをトリガーした

https://code.google.com/p/android/issues/detail?id=22564

私はに労働者フラグメントの初期化を移動しなければなりませんでしたこれを回避するためにアクティビティライフサイクルで後で呼び出される別のメソッドです。メル・スタンレーは、あなたも、あなたがアンドロイドを追加することを確認する必要があります言ったことに加えて

public class BaseActivity extends ActionBarActivity { 

    private static final String TAG_TASK_FRAGMENT = "task_fragment"; 

    protected TaskFragment taskFragment; // Used to hold a reference to the active activity between config changes 

    protected void setupTaskFragment() { 
     // It would be great if we could just do this in onCreate, but setting up the task fragment 
     // before calling setContentView() triggers the bug described here: 
     // 
     // https://code.google.com/p/android/issues/detail?id=22564 
     // 
     // So we just need to make sure Activities that run async tasks call this setup function 
     // before they do. 

     FragmentManager fm = getSupportFragmentManager(); 
     taskFragment = (TaskFragment) fm.findFragmentByTag(TAG_TASK_FRAGMENT); 

     // If the Fragment is non-null, then it is currently being 
     // retained across a configuration change. 
     if (taskFragment == null) { 
      taskFragment = new TaskFragment(); 
      fm.beginTransaction().add(taskFragment, TAG_TASK_FRAGMENT).commit(); 
      fm.executePendingTransactions(); 
     } 

    } 

} 

public class ChildActivity extends BaseActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); // If this call adds a fragment, you will have problems 
     setContentView(R.layout.activity_child); 
     setupTaskFragment(); // So we have to add our task fragment here, after we've called setContentView() 

     // further initialization here 
    } 

} 

/** 
* 
* TaskFragment 
* 
* We use this fragment to manage async tasks between configuration changes. The fragment calls 
* setRetainInstance(true) in its constructor, which makes it so that it will not be recreated 
* between configuration events (like screen rotation). Async tasks running from the fragment 
* can then be kept up to date on which activity they belong to. 
*/ 

public class TaskFragment extends Fragment { 

    private ArrayList<AsyncTask> asyncTasks = new ArrayList<AsyncTask>(); 

    public TaskFragment() { 
     super(); 
     setRetainInstance(true); 
    } 

    public void addTask(AsyncTask task) { 
     asyncTasks.add(task); 
    } 

    public void removeTask(AsyncTask task) { 
     asyncTasks.remove(task); 
    } 

    public Application getApplication() { 
     Activity activity = getActivity(); 
     if (activity != null) 
      return activity.getApplication(); 
     else 
      return null; 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     super.onAttach(activity); 
     for (AsyncTask task : asyncTasks) { 
      task.onAttach(activity); 
     } 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
     for (AsyncTask task : asyncTasks) { 
      task.onDetach(); 
     } 
    } 
} 

Answer 3

：要求することで

は、ここでそのコードは次のようになりますフラグメントがロードされている、あなたのxml活動へのタグ：

<fragment 
android:id="@+id/fragment_container" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:name="com.your_app.name.fragments.NameOfFragment" 
android:tag="fragment_tag" 
tools:layout="@layout/layout_fragment" 
/> 

これは、フラグメントは、それがメルのコードを使用して再ロードされていないXMLを使用して初めてロードされるときにことを保証します。これを外した場合、最初に実行したときに2つのフラグメントがロードされます。これは、完了時にレイアウトを変更する非同期要求があると問題になります。